package com.coolweather.android;

import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

import com.coolweather.android.db.City;
import com.coolweather.android.db.County;
import com.coolweather.android.db.Province;
import com.coolweather.android.gson.Weather;
import com.coolweather.android.util.HttpUtil;
import com.coolweather.android.util.Utility;
import com.example.coolweather.R;

import org.litepal.crud.DataSupport;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

public class ChooseAreaFragment extends Fragment {

    public static final int LEVEL_PROVINCE = 0;
    public static final int LEVEL_CIYT = 1;
    public static final int LEVEL_COUNTY = 2;

    private ProgressBar progressBar;

    private TextView titleText;

    private Button backButton;

    private ListView listView;

    private ArrayAdapter<String> adapter;

    private List<String> dataList = new ArrayList<>();

    /**
     * 省列表
     */
    private List<Province> provinceList;

    /**
     * 市列表
     */
    private List<City> cityList;

    /**
     * 县列表
     */
    private List<County> countyList;

    /**
     * 选中的省份
     */
    private Province selectedProvince;

    /**
     * 选中的城市
     */
    private City selectedCity;

    /**
     * 当前选中的级别
     */
    private int currentLevel;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.choose_area, container, false);
        titleText = view.findViewById(R.id.title_text);
        backButton = view.findViewById(R.id.back_button);
        listView = view.findViewById(R.id.list_view);
        adapter = new ArrayAdapter<>(getContext(), android.R.layout.simple_list_item_1, dataList);
        listView.setAdapter(adapter);
        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
                if(currentLevel == LEVEL_PROVINCE){
                    selectedProvince = provinceList.get(position);
                    queryCities();
                }else if (currentLevel == LEVEL_CIYT){
                    selectedCity = cityList.get(position);
                    queryCounties();
                }else if (currentLevel==LEVEL_COUNTY){
                    String weatherId=countyList.get(position).getWeatherId();
                    if(getActivity() instanceof MainActivity){
                        Intent intent=new Intent(getActivity(),WeatherActivity.class);
                        intent.putExtra("weather_id",weatherId);
                        startActivity(intent);
                        getActivity().finish();
                    }
                    else if(getActivity() instanceof WeatherActivity){
                        WeatherActivity activity=(WeatherActivity)getActivity();
                        activity.drawerLayout.closeDrawers();
                        activity.swipeRefreshLayout.setRefreshing(true);
                        activity.requestWeather(weatherId);
                    }
                }
            }
        });
        backButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(currentLevel == LEVEL_COUNTY){
                    queryCities();
                }else if (currentLevel == LEVEL_CIYT){
                    queryProvinces();
                }
            }
        });
        queryProvinces();
    }

    /**
     * 查询全国所有的省，优先从数据库查询，如果没有再去服务器上查询
     */
    private void queryProvinces(){
        titleText.setText("中国");
        backButton.setVisibility(View.GONE);
        provinceList = DataSupport.findAll(Province.class);
        if(provinceList.size() > 0){
            dataList.clear();
            for(Province province:provinceList){
                dataList.add(province.getProvinceName());
            }
            adapter.notifyDataSetChanged();//当适配器内容改变时，强制调用getView来刷新每个Item内容，实现动态刷新列表
            listView.setSelection(0);//将列表滚动到顶部
            currentLevel = LEVEL_PROVINCE;
        }else {
            String address = "http://localhost:8080/Androidservlet_war_exploded/china";
            queryFromServer(address, "province");
        }
    }

    /**
     * 查询选中省内所有的市，优先从数据库查询，没有再去服务器查询
     */
    private void queryCities(){
        titleText.setText(selectedProvince.getProvinceName());
        backButton.setVisibility(View.VISIBLE);
        cityList = DataSupport.where("provinceid = ?", String.valueOf(selectedProvince.getId())).find(City.class);
        if(cityList.size() > 0){
            dataList.clear();
            for(City city : cityList){
                dataList.add(city.getCityName());
            }
            adapter.notifyDataSetChanged();//当适配器内容改变时，强制调用getView来刷新每个Item内容，实现动态刷新列表
            listView.setSelection(0);//将列表滚动到顶部
            currentLevel = LEVEL_CIYT;
        }else {
            int provinceCode = selectedProvince.getProvinceCode();
            String address = "http://localhost:8080/Androidservlet_war_exploded/china/" + provinceCode;
            queryFromServer(address, "city");
        }
    }

    /**
     * 查询选中市内所有的县，优先从数据库查询，如果没有再去服务器
     */
    private void queryCounties(){
        titleText.setText(selectedCity.getCityName());
        backButton.setVisibility(View.VISIBLE);
        countyList = DataSupport.where("cityid = ?", String.valueOf(selectedCity.getId())).find(County.class);
        if(countyList.size() > 0){
            dataList.clear();
            for(County county : countyList){
                dataList.add(county.getCountryName());
            }
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            currentLevel = LEVEL_COUNTY;
        }else {
            int provinceCode = selectedProvince.getProvinceCode();
            int cityCode = selectedCity.getCityCode();
            String address = "http://localhost:8080/Androidservlet_war_exploded/china/" + provinceCode + "/" +cityCode;
            queryFromServer(address, "county");
        }
    }

    /**
     * 根据传入的地址和类型从服务器上查询省市县数据
     */
    private void queryFromServer(String address, final String type){
        showProgressDialog();           //显示进度条
        HttpUtil.sendOkHttpRequest(address, new Callback() {
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String responseText = response.body().string();
                boolean result = false;
                if("province".equals(type)){
                    result = Utility.handleProvinceResponse(responseText);
                }else if ("city".equals(type)){
                    result = Utility.handleCityResponse(responseText, selectedProvince.getId());
                }else if("county".equals(type)){
                    result = Utility.handleCountyResponse(responseText, selectedCity.getId());
                }
                if(result){
                    getActivity().runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            closeProgressDialog();
                            if("province".equals(type)){
                                queryProvinces();
                            }else if ("city".equals(type)){
                                queryCities();
                            }else if ("county".equals(type)){
                                queryCounties();
                            }
                        }
                    });
                }
            }
            @Override
            public void onFailure(Call call, IOException e) {

                //通过runOnUiThread方法回到主线程处理逻辑
                getActivity().runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        closeProgressDialog();
                        Toast.makeText(getContext(), "加载失败", Toast.LENGTH_SHORT).show();
                    }
                });
            }
        });
    }

    /**
     * 显示进度对话框
     */
    private void showProgressDialog(){
        if(progressBar == null){
            progressBar = getView().findViewById(R.id.select_progress_bar);
            progressBar.setVisibility(View.VISIBLE);
            progressBar.setProgress(90);
            getActivity().getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE, WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE);

        }
    }

    /**
     * 关闭进度对话框
     */
    private void closeProgressDialog(){
        if(progressBar != null){
            getActivity().getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE);
            progressBar.setVisibility(View.GONE);
        }
    }
}
